Rotary electric machine and manufacturing method of rotary electric machine

Abstract

An object of the present invention is to maintain the tightening load between a casing and a stator appropriately even when used in a high temperature environment. A rotary electric machine includes a rotor, a stator made of an iron-based member and provided on an outer periphery of the rotor, and a casing that is made of an aluminum alloy member, houses the rotor and the stator, and fixes the stator by bringing an inner peripheral surface into contact with an outer peripheral surface of the stator. The casing is permanently grown before the stator is fixed in the casing.

1 . A rotary electric machine comprising:
 a rotor;   a stator made of an iron-based member and provided on an outer periphery of the rotor; and   a casing that is made of an aluminum alloy member, houses the rotor and the stator, and fixes the stator by bringing an inner peripheral surface into contact with an outer peripheral surface of the stator, wherein   the casing is permanently grown before fixing the stator in the casing.   
     
     
         2 . The rotary electric machine according to  claim 1 , wherein in the casing, a ratio of an inner diameter when heated at 200° C. for five hours to an inner diameter at room temperature is 100.35% or more and 100.39% or less. 
     
     
         3 . The rotary electric machine according to  claim 1 , wherein the casing is made of an ADC12 member. 
     
     
         4 . A manufacturing method of a rotary electric machine including a rotor, a stator made of an iron-based member and provided on an outer periphery of the rotor, and a casing that is made of an aluminum alloy member and houses the rotor and the stator, the manufacturing method comprising:
 a heating step of heating the casing to bring the casing into a permanently grown state; and   an insertion step of inserting the stator into the permanently grown casing, and bringing an inner peripheral surface of the casing into contact with an outer peripheral surface of the stator to fix the stator to the casing.